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This interactive module introduces the anatomy of the immune system and walks through the timeline of a typical immune response.

This activity explores images of planarians regenerating missing body parts, which serve as phenomena for learning about cell division and differentiation.

This interactive module allows students and educators to build models that explain how the Earth system works. The Click & Learn can be used to show how Earth is affected by human activities and natural phenomena.

This short video explores how a baby’s microbiome is established during birth.

This activity guides the analysis of a published scientific figure from a study on how social status affects the expression of genes involved in immune system processes.

This activity analyzes a published scientific figure from a study assessing if the microbiota from a mother affects the immune systems of the developing offspring.

This video describes how scientists silence different genes in regenerating planaria to study the process of regeneration at the molecular level.

This demonstration models the first step of the HIV life cycle: the binding of HIV envelope proteins to receptors on human helper T cells.

This activity guides students through building a conceptual model of how carbon dioxide affects Earth’s climate.

This video shows real footage of a cytotoxic T cell killing a cell infected by a pathogen.